0x000021BA
ERROR_DS_DOMAIN_NAME_EXISTS_IN_FOREST
The domain name of the trusted domain already exists in the forest.
win32decimal 8634
Matched as: the code as given (hex)
Log a case with no specific solution
Source: System Error Codes (8200-8999) - Win32 apps · CC BY 4.0 · wording unchanged, formatting adapted for this site · retrieved 2026-10-09