Token usage in Power BI

Embed tokens with Pro or Premium Per User (PPU) license are intended for development testing, so a Power BI master account or service principal can only generate a limited number of tokens. Purchase a capacity for embedding in a production environment. There's no limit to how many embed tokens you can generate when you purchase a capacity. Go to Available Features to check the usage value that indicates the current embedded usage in percentage.

Embed Power BI content in an embedded analytics application with service principal and an application secret - Power BI

Learn how to authenticate for embedded analytics using an Azure Active Directory application service principal and an application secret.https://docs.microsoft.com/en-us/power-bi/developer/embedded/embed-service-principal