A family of Microsoft relational database management systems designed for ease of use.
Hi Oliver,
From your description and based on my research, you would like to connect Project to Planner via Planner API. As the query is related to customization with Planner API, I would like to suggest posting a new thread inStack Overflow community. It is a specific channel handling Office 365 API related queries and questions. Thanks for your understanding.
Meanwhile, you may catch the log, and then analyze it by referring toUse the Planner REST API.
Regards,
Tina