Version 7.9.828 suddenly asking for license

My 1Password v7.9.828 has been working fine forever. Tonight, it is opening up as "Read Only" and asking for "1Password Account" or "License" which I can "Buy Now". I went to my receipt email from 2019 and clicked on the link to download the License Key but I get a new tab with the message "Site-not-available". Can someone tell me why this has suddenly happened and how I can get 1Password back functioning? TIA.

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1Password Version: 7.9.828
Extension Version: Not Provided
OS Version: Win 10