I’m another one affected by the Anker 737 not charging, with the same caveats: tried multiple cables rated up to 240W, including the original one, trickle mode makes it work but on 100W only.
Another bit of information I haven’t see in the thread would be Linux kernel logs, one of two pops up:
ucsi_acpi USBC000:00: UCSI_GET_PDOS failed (-5)
or
ucsi_acpi USBC000:00: GET_CABLE_PROPERTY failed (-5)
Both seem to indicate issues with identifying either the cable or PD capabilities. Clearly an issue on the negotation level.
Hopefully we’ll see Framework fixing those, as I don’t hope for Anker to release any kind of firmware upgrade for their power bank (AFAIK they’re not doing so).