I had a similar experience a couple of years ago in a slightly lower-stakes (but still frustrating) context.
I keep Messages on my phone paired to Google's Messages for Web client, because it means I can receive and send texts using my keyboard and mouse in a web browser, an infinitely more comfortable experience than thumbing messages in on my phone's soft keyboard. (And don't even get me started on the annoyance of finding photos or other media to attach, when it's anything other than the most recent shot taken with the phone camera.) Messages for Web is, honestly, the bee's knees.
But because it's a web client gaining access to the inner workings of your Android device's privileged SMS client, a potential vector for anything from identity theft to exfiltration of all your most embarrassing secrets to out-and-out fraud and financial ruin, they keep the connection rather locked down. The pairing method is fairly robust (scan a QR code displayed by the web client using the phone you want to pair to), and web clients need to be re-paired fairly often, especially when they haven't been used in a while.
At the time this came up, I was dealing with the fact that the rear camera on my phone had just bit the dust, a casualty of a swelling battery that popped it right off the back of the device and rendered it non-functional. Naturally, within 2-3 days of that happening, Messages for Web demanded that I re-pair my browser with the phone.
Which involved scanning a QR code.
Which is hard to do without a rear camera. (It wouldn't use the front camera, and it wouldn't accept an already-stored photo from device storage.)
The punchline was, at the time (they've since fixed this), that method of pairing was the ONLY method of pairing available. Meaning, without a working camera on the device, I was locked out of Messages for Web completely, with my only recourse being to either get the phone's camera fixed, or buy a new phone with a working camera.
I eventually did the latter, and Google eventually realized their system was being a pain in the ass by keeping itself a little too secure, so I guess ultimately the story has a happy ending? "Yay."