Grey tank drain line separation

[rjreeves]

Hi all. My ABS drain line has separated from the grey tank. This is on a 2019 21' with 2,500 miles on the axles. I'm having a difficult time determining what the original design called for here and what the parts used were. Not really sure if something is broken, decoupled, incorrectly installed or what. The opaque white flange-like piece with the tabs seems to indicate a twist-and-lock type approach with caulking as an extra precaution but as I said, it's just not clear to me what the design was or cure should be here. Any advice about how to repair/upgrade this problem would be greatly appreciated. As usual I've searched the archives but can't find anything relevant. Thanks in advance.