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<@UBZG6KKFB> unless NetSuite extends the deadline for removal of NLAuth support, I would not expect it to continue to work.  You should absolutely plan to transition to TBA or OAuth 2.0 to be certain you won’t have interruptions after the next release.  They did announce that this would eventually be removed a few releases ago.

Hello, I have seen it will only be for the newly created Restlets: _As of the *2021.1 release*, user credentials authentication for newly created RESTlets will not be supported. If you attempt to authenticate a new RESTlet, with user credentials after your account is upgraded to 2021.1, an HTTP error response will be returned. For more information, see <https://netsuite.custhelp.com/app/answers/detail/a_id/31709#subsect_158928233185|Advance Notice: Upcoming >_<https://netsuite.custhelp.com/app/answers/detail/a_id/31709#subsect_158928233185|Deprecation of RESTlet Authentication Through User Credentials>.