I have downloaded Adobe Content Viewer to my iPad. When I try to sign in with my Adobe ID, I keep getting Authentication Failed. What am I doing wrong?

I have downloaded and istalled Adobe Content Viewer to my iPad. When I try to sign in with my Adobe ID, I keep getting Authentication Failure, what am I doing wrong?

Thanks for the quick reply.
Do you have any examples of system extensions or accessibility features that might be the culprit?  I have actually never heard of those terms before.

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