The current pre-release of the client ("pioneer" in the version) is only compatible to itself. So you can only play with other testers. Please be aware!
Server Update 2023-01-20
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The next server update has been scheduled for the 2023-01-20 somewhere between 22.00-01.00 UTC/GMT.
It will be a minor patch, so the downtime itself shouldn't be long.
What is planned:
Update Server to version v1.12.8 and api to v2.21.0
This together should hopefully fix achievements
More details found here https://github.com/FAForever/server/releases/tag/v1.12.8