Bambu had a major problem with truly warped beds produced in the first quarter of 2023. Typically they were off by 0.7-1.1mm, and until late May-early June replacement beds were often also warped. My experience with the problem and the final result is here.
If you ask Bambu support for help, they will ask you to manually tram the bed. (Print a wrench, it makes precise adjustment much easier). That will make the bed as parallel as possible to nozzle travel, but of course will not make the bed flat. They will also want logs from a small print made with bed leveling turned on (a tiny cube will do).
If you use your favorite search engine to find the expected precision/accuracy of FDM printing you will find that 0.019 inch (0.48mm) is right at the limits. AFAIK, Bambu has never said what they consider to be an acceptable level of flatness.