An missing LLPIN in the MCA V3 portal dropdown is usually caused by using a "Registered User" account instead of a "Business User" account. To resolve this, upgrade your account profile to a Business User under the "Designated Partner" role, ensure your DSC is freshly associated, and use a clean Incognito window in Google Chrome to bypass persistent portal cache glitches.
Data validation errors during GST RFD-01 Annexure B JSON uploads are typically caused by incorrect date formats (must be DD-MM-YYYY), special characters or hidden spaces in copy-pasted data, or disabled Excel macros. To fix it, ensure macros are enabled, paste data as "Values" only to strip hidden formatting, validate the data inside Excel first, and upload the newly generated JSON via an incognito browser window.