Adding some new information here after I had to file my California Form 568 via paper form after it was rejected by e-file. I hope this additional information will benefit others in the future, especially those LLCs (in my case, a SMLLC) formed outside California.
I contacted the California FTB and the representative mentioned that you can use the Temp LLC number (issued by the FTB, not the California Secretary of State) in place of the SoS number, or a Reason Code. They said that since the SoS number is a 12-digit number, to add 3 leading zeros to the 9-digit Temp LLC number so that it meets that requirement. Note, based on my research, SoS numbers generally have a 19 or 20 prefix, but the FTB rep said that the e-file system should accept.
I have made the change in a copy of my 2022 TT file to see if it would reject the use of the Temp LLC number in the SoS number filed on Form 568, and TT did not complain. Looking at the generated form, it does have the Temp LLC number where the SoS number field is. Unfortunately, I will not be able to e-file for a final test until tax year 2023.
