I have 10 paging groups and they worked great until a couple of weeks ago. Some have scheduler enabled others use O365 calendar for scheduled pages. Recently only 1 page group is working as expected. The others do not even show up in the Call Event Log. For some time it appeared that one page group was missing a digit from the Page Group Extension in the Call Event Log. If you call the Page Group Extension they will work but not with either type of schedule.
FBX: 15.0.17.55
Asterisk 17.9.4