You could experience this issue if you don’t enable third-party cookies to be used when accessing iMy-Tyme™ in your web browser. They are needed for iMy-Tyme™ to be able to synchronize with external accounts from Google or Microsoft.
You can allow https://app.imy-tyme.com and https://be.imy-tyme.com in the “Cookies and site data” section of your web browser settings while letting “Block third-party cookies” checked.