MC283865 – Office add-in dialog API hardening update

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check before: 2021-09-14

Product:

Microsoft 365 Apps

Platform:

Developer, iOS, Mac, Web, World tenant

Status:

Change type:

Admin impact

Links:

Details:

We recently made some changes to harden the security of the Office Add-in dialog API, which impacts cross-domain communication. Normally we do not do Message center communications on these monthly changes, but in the case we want to make sure the potential for impact is understood.
Note: If your organization is not using Office Add-ins you can safely disregard this message.
This change only impacts Office Add-ins and does not affect COM/VSTO add-ins.
[When will this happen:]

These changes will take effect in the semi-annual channel on September 14th. Please ensure your add-in is updated before this date.

Change Category:
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Scope:
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Ring:

Created:
2021-09-09

updated:
2021-09-09

task type:
Prevent Or Fix Issue

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