The subpoena must "issue" from the court for the district in which the deposition is to be taken, or in which the records are to be produced or the inspection is to be made. Since you do not reside within the district of the bankruptcy court of Utah, nor are you within 100 miles of the place where you are to appear, the subpoena is invalid.
To be valid, the subpoena would have had to have been issued by one of the four California Federal Bankruptcy Court districts (Northern, Central, Southern Eastern), and it would have had to have ordered to you to appear in a location in that district, and no more than 100 miles from your residence.
Therefore, the subpoena is void.
Note: when I mentioned "court order," I meant literally a separate court order signed by a federal district court judge, rather than a subpoena signed by an attorney.
Hope this helps.
And, if you need to contact me again, please put my user id on the title line of your question (“ToCustomerrdquo;), and the system will send me an alert. Thanks!