Hi David,
the approval won't work if your agents have been manually installed. It will work only if you have Push-installed theose from SCOM and also if RPC Ports aren't blocked.
There are also some specifics, related to that as per Kevin Holman's guide. Here is what I mean:
From:
UR1 for SCOM 2022 – Step by Step
https://kevinholman.com/2022/12/12/ur1-for-scom-2022-step-by-step/
No.1
No.2
and last, but not least:
No.3
Can you please go through all this and test again. Please let me know what the outcome is. Thanks in advance!
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Regards
Stoyan Chalakov