No worries, just use the client that works best for you. I’ll take a closer look into what’s causing this issue and see whether the UI/UX can be improved.
Ideally, when device B doesn’t have the encryption key, it sends a key sync request. Then, when you open the app on device A (the one that already has the key), you should see a popup asking whether to sync the key. Pressing the "Send Key" button should then send the key to device B.
If it’s convenient, could you tell me whether:
1. You never saw the sync request popup on device A, or
2. You pressed "Send Key" but nothing happened afterwards?