Android Client does not ring if a GSM call is in progress

[Chard]

My client has an issue where if a mobile call is in progress the 3cx client does not ring. The IOS app works without any issues.

System set up

Call > Queue > agents (all on 3cx mobile clients)


Push account (Own, working on other systems)
Notifications in android app | Notifications is on and all options enabled

Handset: [Samsung S8, ]
Contacts: [Chard]
Connection: [|3G/4G]
Server: [Google cloud Server v16 Pro 8 SC]
Latest v16 Android Client