It looks like the partner portal that TELUS has with Norton is still using an out of date version of Norton
Here is a screenshot of the error from my Mac that's running Big Sur. The version of Norton that's crashing is 8.5.7f25 (which is the version in the Telus partner portal)
Norton has said that the first version that supports Big Sur is 8.6. (https://support.norton.com/sp/en/ca/home/current/solutions/v119174366?inid=hho_supp_htm_home-cur-ret...)
Any news when the version will be updated in the portal, so customers using Big Sur will be able to download it?