我父母2019年中持B1/2签证来美探亲，入境时拿到六个月的居留许可。期间我递交了I-130表为他们申请父母移民。2019年10月收到I-797 Notice of Action，移民申请得到批准并指导我们可以递交I-485在美转移民身份。可是我父母改变主意了，决定不移民了，想过完2020年春节就回国。所以他们就没有交I-485。结果疫情爆发，他们回国的飞机两度被取消，他们便一直滞留在美国。我没有给他们办过签证延期，因为有I-797, 并且I-797上并未有action的时间限制(deadline)
-That I-797 approval notice for I-130 has noting to do with their legal stay in US.
。请问他们现在在美国的居留是合法的吗？
-No. Their unlawful presence (i.e. illegal stay) has been more than one year and that means if they leave US, they will be subjected to 10-year bar, i.e. they cannot enter US within 10 years. The only way for them to solve this problem is that they file I-485 to get the green card within US. Then, they can give up the green card later if they don't want to stay in US permanently. Then, they can apply for B2 visa again to visit youu after they give up the green card.
他们已经买到了10月底回国的机票了，发现申请申请回国的健康码需要提供“在美合法居留文件”。请问他们可以用入境美国的签证（现已过期）加上I-797作为合法居留文件吗？
-No. See my above explanation
领事馆对此项要求到底严不严呢？他们关键是看什么呢？
