Texas followed the protocol, which included filing a motion for leave to file a bill of complaint in the Supreme Court. The Supreme Court, however denied the motion.
https://www.supremecourt.gov/search.aspx?filename=/docket/do...
https://www.supremecourt.gov/orders/courtorders/121120zr_p86...
155, ORIG. TEXAS V. PENNSYLVANIA, ET AL.
The State of Texas's motion for leave to file a bill of complaint is denied for lack of standing under Article III of the Constitution. Texas has not demonstrated a judicially cognizable interest in the manner in which another State conducts its elections. All other pending motions are dismissed as moot.
Statement of Justice Alito, with whom Justice Thomas joins: In my view, we do not have discretion to deny the filing of a bill of complaint in a case that falls within our original jurisdiction. See Arizona v. California, 589 U. S. ___ (Feb. 24, 2020) (Thomas, J., dissenting). I would therefore grant the motion to file the bill of complaint but would not grant other relief, and I express no view on any other issue.