To add the 
Bleh emoji to Microsoft Teams, follow these steps.
      Open a chat or channel and click the 
Emoji, GIFs and Stickers icon next to the message box, then choose 
Emoji.
      In the bottom right of the emoji panel, select 
Your orgs emoji (the smiley with a dotted outline), then click the 
+ button to upload. Choose the 
Bleh image you downloaded and give it a name.
      Once saved, your custom emoji will appear in the 
Custom section. You can insert it in messages or use it as a reaction by selecting 
More reactions and searching for it.
      
Note: Custom emojis must be enabled by your organisation's Teams settings.