docs, drive and photos are pretty packed for me at least
Unfortunately that's a number a hacker can call to social engineer the employee and steal your account. Same method as in SIM swapping attacks.
1.) Some unexpected glitch occurs (could be the user's fault or could be the company's), and the user's ability to access the service is temporarily interrupted until a human is able to investigate and resolve the problem.
2.) The user is specifically targeted by a malicious actor performing SIM swap and/or social engineering attack.
I'm not really a gambler, but if I'm forced to guess, I'd say #1.
EDIT: clarify initial assumptions