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I've used the Jerboa in the past, and I noticed that the verification error appeared sometimes if the instance was having issues.
Beyond that, many instances use manual verification, and they haven't gotten around to verifying yours yet.
Either way, the only thing you can do for now is to wait and see if the issue resolves itself.
That's a good opportunity to look what other Lemmy apps there are in the F-Droid store.
The list is impressingly long now :-)
I tried Voyager and it doesn't show any of the problems I have in Jerboa while offering everything I need - that solves it very well for me.