To solve this issue, you can follow any of these two method.
You need to use the same channel in ExchangeApp and YouTube app. Your email could have multiple channels or you could use a YouTube app with different channels. In this case, this problem happens.
Just switch channels in your YouTube app and try again. it will work fine.
You can change the video player to an in-built video player to solve this issue. You can change the default video player from left menu > settings > Default video player then choose “In-built Player”.