Please validate if there are errors in the AdminUI.log that is stored, which located in Microsoft Configuration Manager\AdminConsole\AdminUILog, and check the event viewer for any specific errors.
Besides the above checking, there are several steps for generic issues:
-->1. Ensure DCOM is active
-->2. Validate the DCOM permission
-->3.Verify WMI permission
-->4. Check whether the user has the necessary privileges to the SMS provider on the site server
-->5. Check whether the user has the necessary security rights to the database.
-->6. Verify namespace connectivity
-->7. To verify server connectivity
-->8. Verify the SMS Provider details
-->9. Rebuild the namespaces
About the detailed information, please refer to this article:
Note: Non-Microsoft link, just for the reference.
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