> ## Documentation Index
> Fetch the complete documentation index at: https://support.affinity.co/llms.txt
> Use this file to discover all available pages before exploring further.

# Mobile Sign In Office 365 Advanced Threat Protection ATP

> Help center reference: Mobile Sign In Office 365 Advanced Threat Protection ATP

<Note>**Troubleshooting** — fix for a specific issue.</Note>

Certain email providers have advanced security policies that prevent malicious actors from directing users to untrusted sites via their inbox.

With Affinity's [Magic Link](/s/article/What-are-Passwordless-Logins-Magic-Links), users can sign in quickly and easily into the Affinity mobile app. However, they can sometimes be met with the following error on their mobile device:

<img src="https://mintcdn.com/support-affinity/Q1cJJh0hXrTkThQR/images/admin-security-privacy/mobile-sign-in-office-365-advanced-threat-protection-atp/1.jpg?fit=max&auto=format&n=Q1cJJh0hXrTkThQR&q=85&s=dcac2c2758b02abcb74992018c53e940" width="1242" height="693" data-path="images/admin-security-privacy/mobile-sign-in-office-365-advanced-threat-protection-atp/1.jpg" />

## Solution

In order to resolve this issue, Global Admins of the Office 365 account must add the following to the Safe Link Policy within their account:

* [https://sendgridtrack.affinity.co](https://sendgridtrack.affinity.co/)
* [https://affinity.co](https://affinity.co/)
* affinity://