I’ve clicked on the link on the district website and it has taken me to a work/personal email inbox. ​

This is because they also use Microsoft 365. There are two options here. Option 1 is to simply sign out and sign back in again using your district email account. When you’re done simply sign out and sign back into your work/personal email. 

Option two is to use Incognito mode by pressing Ctrl + Shift + N or going to the three dots in the top right corner and pressing incognito mode in your browser, navigating to the district website and following the guide above.