Reason : 

It's because of a mail filter feature you might have > https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/safe-links-about?view=o365-worldwide

If the URL provided in the email is only valid for a single use, it can potentially cause an issue with the Safe Links feature. Since Safe Links redirects the user to a Microsoft server for analysis before redirecting to the actual URL, the original URL may expire or become invalid after the first use. If the URL is time-limited or has a one-time-use restriction, it might not function as intended when accessed through Safe Links.

Solution : 

Adding Zluri as a trusted domain on the email server (steps based on the email server).

Steps:

To disable link previewing or link tracking, which will stop hitting the links: 

• Add our domain as trusted domain ( Which is specific to the mailbox )

Here are the steps on how to disable email servers from hitting links in email for some popular email servers:

• Gmail: To disable the email server from hitting links in email in Gmail, go to Settings > See all settings > Account and Import > Click here to learn more about how Gmail scans your emails > Turn off the checkbox next to “Scan all incoming emails for viruses”.

• Outlook: To disable the email server from hitting links in email in Outlook, go to File > Account Settings > Account Settings > Email > Advanced Settings > Uncheck the box next to “Automatically download pictures and other content in HTML emails”.

• Yahoo Mail: To disable the email server from hitting links in email in Yahoo Mail, go to Mail > More > Mail Settings > Security > Uncheck the box next to “Enable automatic virus scanning.”