While Qatar’s attempt to mediate between the US and Iran might appear laud able on paper, but it has a very dubious track record.
The tiny gulf nation, known for fundding terrorist organisations provided Hamas with over $1.1 billion between 2012 and 2018. Besides, Qatar also strengthened ties with Hezbollah and in Lebanon and partnered with terrorists like ISIS and Jabhat Al Nusra in Syria.
Qatar owns its allegiance to Iran and has funded $ 425 million to its militias. The presence of Al Udeid Air Base in Qatar is dangerous to US, because the military information of US forces is transferred to Iran.
Given these circumstances, Qatar doesn’t appear to be an appropriate mediator for such sensitive disputes as between US and Iran.