The "/t/" is for the Site you are on. But this appears to be the default site, where it shouldn't be used, so something weird is going on. Can you let us know:
1. What version of Tableau Server are you running?
2. What version of VizAlerts are you running?
3. What is the value you set for vizalerts.source.site in config/vizalerts.yaml?
Tableau Server Version: 2019.2.3
VizAlerts version: 2.1.1 (most recent)
vizalerts.source.site value is set to: "#"
I figured it out nvm needed to reset it to "Default" my bad
Great, please mark my answer as "correct", if you wouldn't mind!