Hi @Jessica Poemape
Teams tag is mainly focused on the general issue of Microsoft Teams troubleshooting. According to your description, your problem is a development issue that is not within the scope of our support.The following suggestion is for your reference.
Before uploading a custom app, please make the following preparations:
- Ensure to create your app package and validate it for errors.
- Enable custom app uploading in Teams.
- Ensure that your app is running and accessible using HTTPs.
Then publish your app in Developer Portal by following steps:
Maybe you can also try to use Teams Toolkit to publish Teams applications. Please refer to this reference.
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