In the example below, it appears a program called 'Checkpoint' made some changes to the link.
If you don't see your link starting at the green-yellow arrow with known URL
Instead it has extra stuff at the front similar or more to what you see below.
Hopefully the link still works but if not, there are two possible things that may be going on:
1. If your district maintains your email, the district IT staff would need to be consulted, possibly to whitelist @sirassystems.com in your districts Email system.
Or
2. This program is a anti virus software installed on your computer that has been allowed to read your email and apply changes to the mail to protect.
This software may need to be configured to trust the @sirassystems.com domain.