Hi @Nguyen Manh Hung (DPS.VI.ITM) , welcome to Microsoft Q&A forum.
Regarding question 1, yes when I tried to create notebook I also could not see the option to create it. I have reached out to internal product team and they are working on to fix the issue at the earliest. Apologies for the inconvenience.
For Question 2, ZRS is not supported on few regions hence we see the error message. Please check the supported region in below document. I tried with Japan East and it worked for me.
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