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How about a different phone?
When you checked everything you should consider that the port is not connecting well because of accumulated dirt or that the port is damaged.
I would go for cleaning first.
You can find how this is done on youtube.
looked at the port and it seems clean, no debris inside and connection seems fine, goes in and clicks, my wifes has the same phone and hers works fine with the same pc and cables.
This indicates a broken port.
I would still try cleaning first.