#[0]
I can’t input my private key on the testflight version
Discussion
Are you in the front page or in the settings?
Have you checked that your cliboard is not empyt and it's the private key (starting with nsec)?
You can also login with npub and later switch to nsec in the settings.
Front page. I can input the nsec key but can’t “confirm” anywhere
There's not confirm. You just paste it and it goes in. See the below clip.