Google Voice (the free service) has its own pitfalls, which I believe make it a very poor choice to use for online accounts. I’m speaking from personal experience. If you happen to not use it for a little while, Google Voice will send an email with minimal notice (with Murphy’s Law, this will be during a vacation break) that the number will be deactivated. Once that happens, you cannot reclaim that Google Voice number using the same linked phone number. You have to get a new phone number that has never ever been used with Google Voice and then try to link it. Even then, Google Voice will send the OTP and make it seem as if the linking worked but will show as unlinked (and the Google Voice number unavailable) after just a minute or two. You’ll have to retry with another number over and over again until you start banging your head against the wall. After maybe a few weeks or several weeks, that Google Voice number will not even show up for reclamation.

Google Voice is a total mess, and as a “free” consumer service that Google has shown little interest in maintaining and supporting, you don’t get any kind of support or help whatsoever.

My sincere advice (if you’re a free Voice user) would be to delink your Google Voice number from all critical services. Get a real phone number for which you have the ability to get customer support.