Is this working for some emails or not working for all emails?

Was this working before and stopped working?

If you run ConnectionStringEditor.exe in [K2 > Host Server > Bin] directory, does the EWS connection strings have the Oauth Resources parameter populated?  Or is it still using basic/password authentication?

Dear TinTex,

Thank you for your information.

This is happened only with one instance within a workflow and other instances with in the same workflow is working fine with same user.

When I checked in view flow, this is pointing to workflow email (Not a task email) which sends email to initiator that the request is initiated.

if you have any idea could be appreciated.

Best Regards,

Thriveni

If it is only specific to a single instance of a workflow, then it is perhaps bad data that is being used in the email step.  I would check and compare if any of the data fields, item references, or attachments that are being used in this email step greatly differs from a working instance.

Perhaps these data fields, item references, or attachments are empty or null or returns an error or invalid value which results in this error.

Hi @Thriveni 
Have these answers resolved your question? 

Hi,

I have managed by performing Go To activity to skip that specific step and is resolved and we still monitoring with other instances.

Best Regards,

Thriveni

Hi,

We encountered the same issue/error and was able to resolve it by Go to Activity, as this error is more related to sending an email activity from the workflow .

Regrads

Kal