Thanks for your feedback.
If you still experience the problem in version 3.2.4 please contact us directly through the ‘Contact Support’ button here – http://support.termius.com/
Would be great if you can provide us with the auth logs as well.
I'm also experiencing this bug in version 3.3.5 (Mac).
I'm using an rsa key (without passphrase) to connect to hosts in a group. I've specified which key to use at the group level.
I can connect if any random string into the passphrase box, but the unnecessary pop up is quite frustrating.
This key works without a passphrase if I connect using a local terminal.