How to get the organization/company name in bot and message extension

fabin10 

There are two common reasons that cause this particular error:
The first being the Azure AD application is not figured to be available to any organization. You can confirm the Azure AD application is configured correctly by checking the supported account type configuration found in the authentication section.

The second reason you might encounter this error is due to the Azure AD consent framework.

And as you mentioned ,In the bot payload(context), you will get tenant Id but won't the organization details. You can refer this link to get Org details using MS Graph API.