Unable to sync Explore to montana 700i

Hi There

I have activated my Montana 700i for Inreach service.

When I log in to Explore Garmin website and go to Plans & devices Sync a window pops up to  install Garmin express.

I have allredy installed garmin express and synced my 700i.

I had a previous Delorme  device and had to download inreach sync program to sync device with Explore.

Any help will be appreciated.

Thanks in advance

Vlascot