Just taking a step back to state the obvious.
Nobody should have access to any accounts before their first day of work.
First day of employment is first day with access. Never before, nor after.
Now, if your leadership hires and starts paying salary for staff to work earlier than the first day they spend at location, ie let them work remotely for some time before first visit, then that's fine.
Then a solution like the one presented by @James_Seymour can be used, an online portal for password management of the AD password. There are plenty to choose from, some free, others not, some easy to use and simple to set up, and some not. 🙂
Alternatively
Some organisations can also just ignore that the AD and Google passwords are temporarily different, if they allow Google passwords to be changed in My Account (most who sync passwords from AD actually allow it!).
Then the user will/can just fix it when they come to location for the first time. Either with the help from IT or by using the same password portal as last time. Some even offer third-party user authentication, like e-id, so they don't even have to remember their old initial password.
This, of course, depends on whether their AD account is used as credentials to log into day-to-day systems, which they need to access before first visit. Then they need to keep using their AD account.
--
https://wheretofind.me/@NoSubstitute