Symptoms:
After DX SaaS Update, accessing the "APM Management Modules" is either empty or listing incorrect management modules that do not exist.
DX O2 > Settings > APM Management module has been marked as favorite:
The management module page was reworked from 25.10 and the URL was changed from /digital-oi/settings/apm-
1. Go to DX O2 > Settings
2. Unfavorite APM Management Module and favorite it again.