Custom add-in turn blank in outlook 2016

Runebk 1 Reputation point
2022-10-07T07:45:40.567+00:00

Hi Community!

I'm having problems with my custom add-in for outlook. I usually install it from url manifest in the M365 admin center without any issues.

However I need to install the add-in on an OnPrem Exchange Server using Outlook 2016. I tried through the 365 admin center. The add-in is installed but don't show up in outlook.

I ended up installing it through Exchange Admin Center -> organisation -> add-in -> add from url. I got this error: "Value can not be null. Parameter name: constraintProvider"

I ended up downloading the mainfest og added the add-in from file. The add-in showed as it should in the toolbar and I thought we had solved the problem. However when we tried using the add-in, the task-pane/sidebar was completely blank. Nothing to show.

Can anyone help?

Office Development
Office Development
Office: A suite of Microsoft productivity software that supports common business tasks, including word processing, email, presentations, and data management and analysis.Development: The process of researching, productizing, and refining new or existing technologies.
3,575 questions
Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
7,387 questions
{count} votes