Problem with creating booking page "Any Host Available"

Hello,

I have a problem with creating booking page "Any Host Available". 

I have added second host, but next to host's name there is yellow exclamation mark with the description: "Unable to access this calendar so attendees can't book this schedule". Contact the host to reauthorize the account or remove the host." 

My invited host has synchronized and shared his calendar. 

I have basic license with Zoom Scheduler. Same license has my invited host.

Can you help me?