Chosen Solution
Replaced the port twice now. If the 11 Pro Max is on speakerphone and they are talking, if the other person begins talking at all they will cease being able to hear them until they stop talking. Have yet to find a solution to this issue.
If you have tried two different charging ports I would next try updating the phone to rule out software. If it doesn’t fix the problem the next step would be to install the logic board into another known good housing if the problem is still there it will be a board issue if the problem is solved it will be a parts issue which would point to the charging port assembly.
There is no solution because this is not related to the phone itself, it’s likely how the carrier’s echo suppression is implemented.
