Visa appointment and client letter


I have consular approved H1B petition upto Feb/2022 and need to appear Visa interview for stamping. Scheduled interview in last year got cancelled, due to COVID.

I have client letter, it was dated Feb/2020 with the date mentioned in letter from Mar/2020 to Apr/2022. But I dont have the latest/recent client letter.

Can I go for stamping with this client letter (normal appointment)?. Or will it be a problem?.

Your answers will help.