Couldn't verify that key. Try again.
Settings > API Keys' "Test" button does a safe dry run for a live or test key (checks the key is active, its connection is still connected, and the connection is ready to send) without sending a real WhatsApp message. This code means that check itself couldn't run, not that the key is broken. A check that ran and found a problem shows its own message under the key instead, such as "This key has been revoked - create a new one to test."
Check your internet connection.
Wait a moment, then click Test again in Settings > API Keys.
If it keeps happening, check the connection's status, since the connection itself may need attention.
Contact support at hello@theavoxai.com with this code if the problem persists.
Still stuck? Send AVX-3055 to hello@theavoxai.com along with what you were doing when it happened.