Hi, @Viccc
Thank you for posting in Microsoft Q&A forum.
When there is "Waiting to begin installation" state, normally it indicates that there is already a running process and it has to wait until the process is end. Check that in the software center if there is other task shown as "installing".
And make sure boundary group are configured correctly and the application is distributed to DP successfully when it shows "Waiting to begin installation".
Also we may check AppEnforcr.log, AppDiscovery.log, AppIntentEval.log and CAS.log for detailed information
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