In that case, could you please send an email to social_support(at)constantcontact(dot)com with some examples of affected links / the tracking links that aren't working? Or, if you could forward one of the emails you've received that's had issues with accessing the links, that can help out as well.
Along with the email / forward, could you please provide whether this is happening for you on multiple devices, on different networks (e.g. on mobile vs. your home/work wifi), or when opening in different email programs / apps? We'll try to follow up when we have more info, and our T2 team has had some more time to look into it.
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