4.我們的I-94一直有效，可能失業後公司withdraw 我的H1-B，但在前一家公司的H1-B仍然有效，可是他們不願給出符合移民局要求的雇主證明
These are two different requirements, not the same thing. And to me, both are easy to answer according to your description
First is to prove that you have work authorization, so the two H1 I-797/I-94 (from both companies) will suffice. Or if you have c9 EAD, you are also fine for this requirement.
Second is employment verification letter to prove that the LC same or similar job offer is still good. If you are working for a company that is sponsoring you H1, I don't see why they would refuse to write such simple letter? (unless it's NOT a similar job so they don't want to lie.)
These are two different requirements, not the same thing. And to me, both are easy to answer according to your description
First is to prove that you have work authorization, so the two H1 I-797/I-94 (from both companies) will suffice. Or if you have c9 EAD, you are also fine for this requirement.
Second is employment verification letter to prove that the LC same or similar job offer is still good. If you are working for a company that is sponsoring you H1, I don't see why they would refuse to write such simple letter? (unless it's NOT a similar job so they don't want to lie.)
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