Scheduler

I need help with setting up Zoom to work on my desktop Outlook. I have a business account with Microsoft 365.

I set up zoom scheduler, so that customers could book into different meeting slots. I had it set where attendees would get an automatic booking confirmation email and I would also get an automatic email to say a slot had been taken. Up until this morning, it has been working well. All of a sudden, it has stopped working. The attendees are not getting a booking email and neither am I.  They still get an SMS, but not an email which has the zoom details in it. None of the emails are going into spam either, so it seems they are just not sending at all.  I haven't changed any of the settings, and I've tried to get in touch with zoom over phone, live chat and by submitting a ticket, but I haven't got anywhere. When I was setting up the scheduler it didn't say there was a limit on emails and I can't find anything in my plan information that suggests there is a limit on the number of automatic emails sent either. Has anyone had this issue before please?  

I bought a license for Zoom Scheduler a few hours ago. When I click on it,  it says "looks like you don't have Zoom Scheduler"  - then when I click to buy it, it says I can't and that I owe 0$. In billing, it shows that I have a license for Zoom Scheduler.   I've logged out and back in several times. I've restarted my computer and logged on and off my internet profiles. I've cleaned out the cookies.   When can I expect to be able to use the service I paid for?