H1B Extension, Amendment filing with new Client, Location and Job role.

Yes, based on what you have described, the case is likely to receive an RFE. It's a common occurrence.

Will it be problem if I don’t have marriage certificate to show them at N400 interview?

Just explain that you are married. If you are asked for a copy of the marriage certificate, explain as you did on this forum and the interviewing...

Can I change my H-1B visa from a non-profit organization to a multinational company ?

Yes, you can try to transfer in the future but the petition would be subject to the cap. You may be subject to the H1B Lottery at that time.

Do I need to use I 140 premium or just stick to a regular service?

Premium Process is always the recommended option because otherwise, you are facing a very long wait for the I-140 petition, and the overall process...

Are we required to file a I-601a with USCIS?

It sounds like you need help with the process from an immigration attorney. You can't file an I-485 for him based on your fact pattern. Yes, you...

Me and my spouse of 8 months are getting a divorce i filed for her citizenship but i want to cancel ?

Talk to the attorney that filed the immigration documents. If you don't have one, consult with one to discuss your options.

What options do I have to stay in USA if my i94 is expired and H1B extension is denied and H1B amendment is still pending?

Speak to the attorney who filed the extension and amendment. If you can't, seek independent counsel to consult.

What options do I have to speed up or jump to i-485 ?

A FOIA may or may not work to obtain your entry information. I would recommend to talk to an immigration lawyer to understand your complete...

No, you don't need to update your foreign address at this time. However, do keep an eye out on the petition and the priority date so that you can...

When will my receipt notice from the USCIS arrive?

Check whether the payment for filing fees has cleared and try calling USCIS customer service. Hopefully, you've received something by now.