I am having this same issue as well.. SCEP is ont he list of installed application, but I cannot open the GUI.
Here is the log from EPAgent.log
<![LOG[Failed to check enrollment url, 0x00000001:]LOG]!><time="04:04:06.795-60" date="08-05-2022" component="EndpointProtectionAgent" context="" type="2" thread="4548" file="mdmreglib.cpp:1219">
<![LOG[Endpoint protection workload is NOT migrated to Intune. SCCM will apply policy.]LOG]!><time="04:04:06.795-60" date="08-05-2022" component="EndpointProtectionAgent" context="" type="1" thread="4548" file="epagentutil.cpp:1367">
<![LOG[Failed to get EP event code under registry key SOFTWARE\Microsoft\CCM\EPAgent]LOG]!><time="04:04:06.795-60" date="08-05-2022" component="EndpointProtectionAgent" context="" type="2" thread="4548" file="epagentimpl.cpp:1742">
<![LOG[Failed to get EP event message under registry key SOFTWARE\Microsoft\CCM\EPAgent]LOG]!><time="04:04:06.795-60" date="08-05-2022" component="EndpointProtectionAgent" context="" type="2" thread="4548" file="epagentimpl.cpp:1747">
<![LOG[EP State and Error Code didn't get changed, skip resend state message.]LOG]!><time="04:04:06.795-60" date="08-05-2022" component="EndpointProtectionAgent" context="" type="1" thread="4548" file="epagentimpl.cpp:180">
<![LOG[Failed to get EP event code under registry key SOFTWARE\Microsoft\CCM\EPAgent]LOG]!><time="04:04:06.795-60" date="08-05-2022" component="EndpointProtectionAgent" context="" type="2" thread="4548" file="epagentimpl.cpp:1742">
<![LOG[Failed to get EP event message under registry key SOFTWARE\Microsoft\CCM\EPAgent]LOG]!><time="04:04:06.795-60" date="08-05-2022" component="EndpointProtectionAgent" context="" type="2" thread="4548" file="epagentimpl.cpp:1747">
<![LOG[State 1, error code 0 and detail message are not changed, skip updating registry value]LOG]!><time="04:04:06.795-60" date="08-05-2022" component="EndpointProtectionAgent" context="" type="1" thread="4548" file="epagentimpl.cpp:233">
<![LOG[Device is a workstation, no need to check for downlevel defender]LOG]!><time="04:04:06.796-60" date="08-05-2022" component="EndpointProtectionAgent" context="" type="1" thread="4548" file="epagentutil.cpp:1415">
<![LOG[Defender not detected]LOG]!><time="04:04:06.796-60" date="08-05-2022" component="EndpointProtectionAgent" context="" type="1" thread="4548" file="epagentutil.cpp:1433">
<![LOG[Failed to check enrollment url, 0x00000001:]LOG]!><time="04:04:06.796-60" date="08-05-2022" component="EndpointProtectionAgent" context="" type="2" thread="4548" file="mdmreglib.cpp:1219">
<![LOG[Endpoint protection workload is NOT migrated to Intune. SCCM will apply policy.]LOG]!><time="04:04:06.796-60" date="08-05-2022" component="EndpointProtectionAgent" context="" type="1" thread="4548" file="epagentutil.cpp:1367">
<![LOG[Service startup notification received]LOG]!><time="04:18:30.536-60" date="08-05-2022" component="EndpointProtectionAgent" context="" type="1" thread="7048" file="fepsettingendpoint.cpp:297">
<![LOG[Endpoint is triggered by CCMTask Execute.]LOG]!><time="04:18:30.551-60" date="08-05-2022" component="EndpointProtectionAgent" context="" type="1" thread="1848" file="fepsettingendpoint.cpp:266">
<![LOG[Failed to check enrollment url, 0x00000001:]LOG]!><time="04:18:30.755-60" date="08-05-2022" component="EndpointProtectionAgent" context="" type="2" thread="1848" file="mdmreglib.cpp:1219">
<![LOG[Endpoint protection workload is NOT migrated to Intune. SCCM will apply policy.]LOG]!><time="04:18:30.755-60" date="08-05-2022" component="EndpointProtectionAgent" context="" type="1" thread="1848" file="epagentutil.cpp:1367">
<![LOG[Failed to get EP event code under registry key SOFTWARE\Microsoft\CCM\EPAgent]LOG]!><time="04:18:30.755-60" date="08-05-2022" component="EndpointProtectionAgent" context="" type="2" thread="1848" file="epagentimpl.cpp:1742">
<![LOG[Failed to get EP event message under registry key SOFTWARE\Microsoft\CCM\EPAgent]LOG]!><time="04:18:30.755-60" date="08-05-2022" component="EndpointProtectionAgent" context="" type="2" thread="1848" file="epagentimpl.cpp:1747">
<![LOG[EP State and Error Code didn't get changed, skip resend state message.]LOG]!><time="04:18:30.770-60" date="08-05-2022" component="EndpointProtectionAgent" context="" type="1" thread="1848" file="epagentimpl.cpp:180">
<![LOG[Failed to get EP event code under registry key SOFTWARE\Microsoft\CCM\EPAgent]LOG]!><time="04:18:30.770-60" date="08-05-2022" component="EndpointProtectionAgent" context="" type="2" thread="1848" file="epagentimpl.cpp:1742">
<![LOG[Failed to get EP event message under registry key SOFTWARE\Microsoft\CCM\EPAgent]LOG]!><time="04:18:30.770-60" date="08-05-2022" component="EndpointProtectionAgent" context="" type="2" thread="1848" file="epagentimpl.cpp:1747">
<![LOG[State 1, error code 0 and detail message are not changed, skip updating registry value]LOG]!><time="04:18:30.770-60" date="08-05-2022" component="EndpointProtectionAgent" context="" type="1" thread="1848" file="epagentimpl.cpp:233">
<![LOG[Device is a workstation, no need to check for downlevel defender]LOG]!><time="04:18:30.770-60" date="08-05-2022" component="EndpointProtectionAgent" context="" type="1" thread="1848" file="epagentutil.cpp:1415">
<![LOG[Defender not detected]LOG]!><time="04:18:30.770-60" date="08-05-2022" component="EndpointProtectionAgent" context="" type="1" thread="1848" file="epagentutil.cpp:1433">
...and this is the status in SCCM console: