Temp is an issue, depending on the type of solder used. The lead free stuff I found easily needs another 50-100 degrees.
The tip shape can have an effect on transferring the heat, try the largest mass and shape that will fit.
The tip should have all oxidation cleaned off, it tinning alone won't do it, use a tin/paste.
The tip should be freshly tinned and you should see flux still burning off as you are using it.
Adding new flux, solder, or solder with flux should greatly help conduct the heat quickly.
A lot of factors that can have an adverse effect on desoldering the lead free stuff. I've had my challenges and done some damage. Lessons learned.
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