I've had issues with discord while using a VPN related to phone number verification because I have multiple accounts but you can't share phone numbers between them, which is frustrating considering they clearly understand that people have multiple accounts with the switcher. I did some searching and I saw somebody on reddit a month ago recommending TextNow, but not sure how viable it is as a long-term solution, but might be worth looking into?
I get that they need to combat spam and other abuse, but this causes so many problems.