Email is a dangerous place to work in group and among many people.
I write this separately and internally for our team. Do not share this.
Just do not quarrel, or say anything uncooperatively in the mail that cc to many people. Say just what is how can you help with the best efforts you have now and will seek further ways around.
The tone of emotion you expressed was interppreted negatively by counter parts. Others like Dr. BL may soon get the feedback from them.
Go to the website of immigration, ask someone on how the process of visa on arrival is step by step, give the instruction out to the person.
Try to be helpful in every mails you get. This is the art of working collabooratively in the network.
You are learning, every events are teacher. Don't be set back.
Dr. BL is manager, ask him. Chair will not involve in every details of business.