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Total Cookie Protection Blocking Single Sign Out

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My website uses Single Sign Out using a Front Channel SSO URL. This requires the browser to navigate to my application in an iFrame from another website, passing along with my site's authentication cookie, so my website can sign the user out. I have this cookie set to SameSite=none & Secure=true, so it can be transmitted cross-site. However, Total Cookie Protection, which is the default setting on Firefox, is blocking this cookie, which causes the Single Sign Out feature to fail. If I lower the setting to just "Cross-site tracking cookies", the cookie does get properly transmitted, but I cannot expect all of my users to know to go into their settings to enable this.

What can I do to allow Single Sign Out from a Front Channel URL to work in the default Firefox settings? This is not a problem with the default Chrome settings. Thank you.

My website uses Single Sign Out using a Front Channel SSO URL. This requires the browser to navigate to my application in an iFrame from another website, passing along with my site's authentication cookie, so my website can sign the user out. I have this cookie set to SameSite=none & Secure=true, so it can be transmitted cross-site. However, Total Cookie Protection, which is the default setting on Firefox, is blocking this cookie, which causes the Single Sign Out feature to fail. If I lower the setting to just "Cross-site tracking cookies", the cookie does get properly transmitted, but I cannot expect all of my users to know to go into their settings to enable this. What can I do to allow Single Sign Out from a Front Channel URL to work in the default Firefox settings? This is not a problem with the default Chrome settings. Thank you.