B2b invoice

Yes ...... but I doubt that whether TAN based GST no is acceptable in B2B sale even portal do not accept the same.

Being a registered taxable person, now your supplies would be under tax invoice with GSTIN. Hence your supplies would be B2B.

Further, as per your query there is doubt regarding your GSTIN because GSTIN is PAN based not TAN base. However, TDS registration under GST can be obtained using PAN and TAN. please clarify if your have taken a normal registration or TDS registration.