Unable to add external contacts to Channels

Hi Zoom (or Zoomers),

I have a pro account. I updated the Client this week.

I have three external Contacts in Team Chat. 

I have created a Team Chat private ‘Channel’.
I have selected the following option in the channel settings: “External users can only be added by account owner and admins”

I select the Channel ‘Add members’ option.

The ‘Add members’ dialog box shows my three External Contacts.

The dialog box seemingly does not allow me to 'select' any of the three External Contacts.

The ‘Add’ button at the bottom of the dialog box is greyed out.

As a plan B… I sent a link to the channel to an external contact.  When the external contact taps on the link… he is told: ‘The channel cannot be found’. 

Thanks in advance for your help !

they have no plan to fix this issue coz the zoom calls already have messenger on it. I am also planning this to integrate to my website as a file/messanger app but sharing channel does not work. this is a complete waste of idea