Automatic created fitting suits at avatar upload in MD12 fails

Hi MD I have an issue with my Avatars that I am bringing into MD12. Id very much like to have them working with the new auto fitting suit creation at avatar upload but I seem to run into the same issue again and again no matter what I do. My Avatars are originally for Second Life. The Avatar is by default in several pieces in Blender but I merge them all into one full body mesh before I export. I make sure the avatar is the correct size by comparing it to the size of one of the inbuild avatars (Feifei) - mine is a tad bit larger but she is still under 2 meters so I should be good regarding that I think. The SL avatar is in T-pose and that seems to break the attachment points. If i move her to A-pose before export from Blender the attachment points works, but the auto fitting suit creation breaks in both scenarios. I have tried importing as fbx, collada and obj, all give me the same results where the auto fitting suit breaks (and often the attachment points too). The error message is always the same: "Avatar must be in a T-pose or A-pose" both where the attachment points and the fitting suit fails. The auto fitting suit fails just before "Synchronization complete". I tried with T-pose and with A-pose for the avatar before export out of Blender. I tried with and without including the armature when exporting from Blender. I am able to get the avatar into MD with the armature working - but it does not seem to make a difference whether its there or not regarding the auto fitting suit creation failing. I tried scaling the avatar smaller (down to 150 cm) to make certain its under 2 meters tall. Still it did not work. I noticed her feet are somewhat under the base plane when she has high heel foot shape. So I tried move her up a bit to have her above the plane - that made no difference either. I have experimented with deleting vertex groups and applying armature modifier and setting rest pose to A-pose/T-pose in Blender before export and of course i make sure to apply transforms as well. I am running out of ideas on what might affect this, although I am pretty sure it must be something carrying over from Blender before I import to MD12. A couple of days of testing any scenario I could think off and researching the internet for anyone facing this has given me no results so now I give in and ask for help here. Please help :) 

Best regards Celestine Ghiardie