HueLifeCMO Knowledge Base

Fix: HubSpot Add-in Keeps Logging Out in Outlook

Symptom: The HubSpot panel inside Outlook (the sidebar where you log emails, track opens, and start sequences) keeps signing out and asking you to log into HubSpot again — often every time Outlook is reopened.

Important: This is the HubSpot Sales add-in losing its session — not Outlook or your Microsoft account signing you out. (If Outlook/Microsoft itself logs you out, that's a different problem — see 00_START_HERE_Email_Summary.md, Part 4.)

Source: HubSpot Knowledge Base + Community, verified June 2026.

✅ Do this first (fixes it for most people)

Sign into the HubSpot add-in with email + password — NOT "Sign in with Microsoft/Google."

HubSpot states it plainly: "If you're using a third-party login method like Microsoft, the cookie will be lost after closing Outlook, and you'll have to log in again."

Steps: 1. In the HubSpot add-in panel, sign out. 2. Sign back in by typing your HubSpot email + password. 3. Check "Remember me." 4. Do not click the "Sign in with Microsoft" / "Sign in with Google" button.

That single change stops the every-reopen logout for most users.

If it still logs out, work down this list

2. Allow third-party cookies

The add-in runs in a webview that requires third-party cookies. If they're blocked, the session can't persist. - In the browser the add-in uses (Edge/Chrome) → cookie settings → allow third-party cookies, or whitelist [*.]hubspot.com. - On Mac/Safari: Safari → Settings → Privacy → uncheck "Prevent cross-site tracking."

3. Increase the inactive-session timeout (Super Admin)

A short timeout logs you out after idle time (e.g., 24h). - HubSpot → Settings → Account Defaults / Security → Inactive session timeout → set a longer duration. (Requires Super Admin.)

4. Make sure you're on the Office 365 add-in (not the old desktop one)

HubSpot no longer develops the Outlook desktop add-in (due to "New Outlook" changes) — it's the version notorious for "prompts login every time." - Remove the legacy desktop add-in and install/activate the HubSpot Sales Office 365 add-in (the supported, web-based one).

5. Clear the slate

💡 Mitigation: you may not need the add-in for basic logging

If outgoing-email logging is set up as a server-side Auto-BCC rule (see CEO_Outlook_Stack.md, Section 3), your sent mail logs to HubSpot even when the add-in is signed out — it runs on the mail server, not the add-in. Then the add-in login only matters for the advanced features (open/click tracking, sequences), which the fixes above are meant to stabilize.

Sources