Outlook does not sync on home internet but start syncing on mobile hotspot

Outlook does not sync on home internet but start syncing on mobile hotspot

As per the title, I recently started to have this problem with my outlook. To fix the issue, enabled MFA and app password but in vain then I shifted my system wifi to my mobile hotspot and it started to sync. Anyone can guide what needs to be done at my ISP end to fix this issue?
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