Do I need a waiver to re-enlist with an RE-2 code?

If you have an RE 2 you just have to have been out of the Army for 93 days is what the regulation says. No waiver necessary. This isn't a common RE Code so you may want to have your recruiter double check the regulation.

You should be good to go with an RE2 for reenlistment, unless the MOS requires a Secret clearance....in which case it could require a waiver. Enlistment standards have dramatically increased in recent years, so, be patient and check all the boxes. And, if needs be, consult the recruiting site Commander foe further guidance. That's why they are there.

V

AR601-210 Para 3-19
2) For applicants who served in RC, the following documents will verify PS:
(a) DD Form 214 or DD Form 215 will be used to verify all periods of active and inactive military service of the member before the date of his or her last separation from active military service; however, entries may appear in error to the recruiter, or the applicant may dispute the entries. Only the original form, the actual carbon copy, a certified copy of the original form, a legible copy verified by REDD from Defense Manpower Data Center, or a records depository copy furnished by the recruiting official under paragraph 3–19c is authorized for verification purposes. DD Form 214 or DD Form 215 will not be used to verify RC membership, or the nature of the RC service after the member’s date of last release from active military service, unless recruiting officials obtain an accompanying discharge order.
(b) The recruiting battalion operations NCO or officer is authorized to use the HRC Assignment Orders and Resource Systems to verify RC service. This verification may be used when all other attempts to obtain documents have been exhausted.

That might be it.

Para 3-20 Table 3-1 regarding an RE-2 "Applies to: Soldier separated prior to the effective date of this regulation. These codes will not be used. Eligibility: Qualified for enlistment, provided reason and authority does not preclude enlistment or require a waiv- er. Applicant may not enlist until 93 days after separation if otherwise qualified." Is your recruiter waiting for the 93 day clock to run out?