Hm, I can't reproduce, but this seems like an etp-breakage due to likely being due to how cookie partitioning works. The login flow is through `triangle.com`, but the page is `www.canadiantire.ca`. For me (likely) the correct storage permissions were set. Going through the flow again (starting from `canadiantire.ca` lets me login the the site.
Bug 2015409 Comment 3 Edit History
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I can reproduce this, it seems like an etp-breakage due to likely being due to how cookie partitioning works. The login flow is through `triangle.com`, but the page is `www.canadiantire.ca`. For me (likely) the correct storage permissions were set on the first try where I also had to go through the register flow. Going through the flow again. Starting a new session, I had to go through the login flow again, starting from `canadiantire.ca` for the login to work.