In this post, you’ll learn more about the Error TBSIMP_E_TOO_MANY_TBS_CONTEXTS – 0x80290217 that is returned when working with the COM-based APIs in Win32
Win32 COM Error
TBSIMP_E_TOO_MANY_TBS_CONTEXTS – 0x80290217
Win32 COM Error Error Description
A new TBS context could not be created because there are too many open contexts.