Converting .docx to PDF - Microsoft Office has identified a potential security concern.

Tried to convert a Word document (.docx - Officed 365) to PDF and got a security warning.

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Microsoft Office has identified a potential security concern.

Microsoft has blocked macros from running because the source of
this file is untrusted.

The Security level is set to High.
Please run the application which created this document, in
the 'Security Warning' dialog select the check box 'Always
trust macros from this source' and enable macro's created by
Adobe Systems Inc.

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Checked out forum posts but could not sort this out.

Have added the Acrobat folder to Trusted Locations in Word Options 

(Options>Trust Center>Trust Center Settings>Trusted Location)

No idea what else to try.

The following is a 'long shot': in the past I did not encounter this error. Just very recently I uninstalled my '3rd party' AV software and Windows is now protected by the native AV software (Windows Defender).
Could it have something to do with Windows Defender??
It is running in default settings.

Thanks!