Oppo R9s Plus won't hold new apps

A

AC Question

Hi there.
I am new here, so be gentle. I am at my wit's end (that's why I am here), with this new phone. I cannot get it to take a new messages app for one thing. My previous phone used Textra with no issues, but I cannot for the life of me get this new phone to accept any other message app, other than the default pre loaded app. I have tried many, even the google message app & always get the same message saying that for message security, the default app will be re-installed. I go to Setting-app management-default apps-Textra.. Oppo Changes it back.

I am also using Nova launcher as well, which was a real struggle to get it to hold as the default, but somehow I managed it..

Any idea's??

Thank you in advance.
 

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