I had the same problem.
Discourse forum is running Fine
I have installed the APP on android, it work fine also accesing my forum, meta.discourse.org forum and others.
At some time I changed my forum address. Then I had to delete the access on the app and create a new one.
This works for my users (nobody has reported incident, and I check with some on their android and it works fine), but doesn’t work in my case.
All the others access are running fine but the one to https://circulotelecos.com give e an error message
Authorize application access
“Discourse - HUAWEI P20 Pro” is requesting the following access to your account:
. Read and clear notifications
. Read user session info
Authorize
If I click on Authorize I get this message
Oops
The sofware powering this discussion forum encountered an unexpected problem. We apologize for the inconvenience.
Detailed information about the error was logged, and an automatic notification generated. We’ll take a look at it.
No further action is necessary. However, if the error condition persists, you can provide additional detail, including steps to reproduce the error, by posting a discussion topic in the site’s feedback category.
Finally
I deleted the APP
reboot the device,
re-installed the APP
No site configured, then I reconfigured the site.
And it works.
Don’t know the issue but it seams to be solved