I've called for password resets before. Sometimes the email doesn't come in or can take like an hour (fuck "Magic links" and email OTPs...). I've even had support reset it and a day later get the half dozen reset requests I made.
Just because something appears simple and obvious doesn't mean it is. There's a lot of ways for those systems to fail. Might be the user's connection or might be the server the user is connecting to and the customer support is sending through a different one.
Big lesson I've learned is that if a lot of people are struggling with something that seems obvious then it probably isn't.