Unable to schedule a meeting

[RNelladC]

I've been using Firefox for sometime (on Windows 11 Home).

For some bizarre reason, I've not been able to schedule meetings on some evenings and mornings too.

I've had to switch to Skype, which is very annoying since I use the paid version of Zoom (I'm an online tutor and use Zoom for teaching).

It's been happening only in the past couple of weeks.

Any ideas as to why sometimes I can schedule a meeting and sometimes I cannot?