Hi there, thanks for joining the conversation.
I totally understand the urgency of this matter. Please know that our Engineering Team is aware of this issue and is still working diligently to resolve it.
While we're unable to provide exact dates for when this issue will be fixed, I encourage you to contact our Customer Care Team to get updates about this concern. They can add you to our notification list, and you'll receive an email once an update is available.
In the meantime, you'll want to utilize the information shared by Rose_A above. This shows another way to send a W9 form to your contractors aside from email.
You can visit this page where you can search for an article that will help you in your QuickBooks Online tasks: Help Articles.
I appreciate your patience while we work to fix this. Feel free to leave a reply if you have any other QuickBooks-related concerns. I'd be glad to help. Take care and have a good one!