CSRF Token validation failed issue
We have created an Excel Add-in and ever since the Chrome 80 update (the one where they changed the SameSite default to lax) we get this error "HTTP request failed403,Forbidden,CSRF token validation failed". We do know this has to do with the SameSite property not being set to None explicitly and then it defaults to Lax.
This only happens when the add-in runs in the iframe (Excel) and only when running on Excel online (Excel on the web).The add-in functions as expected in Excel Desktop and as a standalone app in the browser.
Does Microsoft specifically the add-in team have any workaround or solution regarding this?