Synch with all my calendars

Hello to all,

I am new to this forum.

For my business, I want to use an online appointment booking application to make it easier and save me time.

I discovered yesterday Microsoft Bookings which seems to me not too bad in this matter!

I configured it, tested it. But! There is always a but.

I have several calendars to segment my activity but they do not synchronize with Bookings. Only my main one. Which unfortunately does not suit me at all...

Do you know how I can proceed please? My principal is well synchronized with "My Organization" but I can't do it with the others...

I thank you and wish you a nice day.

Sylvain