Have you set the IsHtmlproperty to true within the Office365.V2CalendarPostItem() function or the Office365.SendEmail() function?
On your side, please consider remove the Office365 connection from your app, then re-create a new connection to Office 365 Outlook connector.
Note: The Office365 connection has been renamed into Office365Outlook.
On your side, please use the Office365Outlook connection to replace the previous Office 365 connection. Also please make sure that you have set the IsHtmlproperty to true within the Office365Outlook.V2CalendarPostItem() or Office365Outlook.SendEmail() formula.
Community Support Team _ Kris Dai If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
thank you very much for your kind reply. The problem here exists before(!) the mail is sent to a user. In the app itself the 'review' screen shows the html tags without being interpreted as html. The html-text itself is saved in a variable [called 'InternalMessage' resp. 'Regarding'] - maybe anything wrong here?