Here is my current experience with Business account inviting personal Teams and web based method selected.
I question why documentation does not exist or is hard to find.
- Admin invite to personal Steve - Screenshot from 2022-12-07 16-39-49
- Steve clicks link and chooses web based solution - Screenshot from 2022-12-07 16-40-12
- Steve joins meeting - Screenshot from 2022-12-07 16-40-45
- Admin accepts guest and is in meeting. - Screenshot from 2022-12-07 16-41-58