"BellSouth's Marriott code 256810 may still be active in Marriott's GDS system despite AT&T's acquisition in 2006. Codes from legacy companies often persist. No verification incidents documented. AT&T (which absorbed BellSouth) has a separate Marriott code (ATT) rated Low. Legacy codes from acquired companies are among the lowest-risk as they are rarely flagged for active monitoring."

"I think the last time I was asked for proof was in a JW Marriott in Beijing. I have never been asked in the US or Europe. Without a business card or ID, you may have an issue. Maybe you can contact the hotels in advance to see what info they need. I don’t remember if LinkedIn is available in China so I would talk to your Corp Travel team to see what they can do. Good news is that hotels are so much cheaper in China compared to ROW right now. ."

"GAP Inc's Marriott code GAP is listed in corporate code databases. No verification incidents documented in FlyerTalk or Reddit discussions. Clothing retail corporate codes at Marriott receive minimal attention from front desk staff — retail employee IDs are not standardized enough to be reliably verified. US domestic properties rarely verify retail-sector codes."