Hi @JulianSymonsFTGITMGR-3282 ,
Thank you for sharing the event logs!
I notice that you are receiving the following error:
The client and server cannot communicate, because they do not possess a common algorithm.
According to several sources, this error can occur if you have not enabled either TLS 1.2 or 1.3 on the Azure AD Connect server, OR if you have not updated windows to support that version of TLS.
You need to enable TLS 1.2 in both the schannel regkeys and the .netframework regkeys, and if you just enable it in one you may still run into this issue when enabling SSPR. (See related discussion.)
Let me know if you have further questions!
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