Date: 202108
Local time of day: 0001-0600
Location: ZZZ.Airport, US
Flight conditions: VMC
Light: Night
Aircraft: EMB ERJ 170/175 ER/LR
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Parked
ATC / advisory: Ramp ZZZ
Reporter organization: Air Carrier
Reporter function: Captain
Reporter qualification: Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Human factors: Confusion; Fatigue; Communication Breakdown; Situational Awareness; Training / Qualification; Time Pressure
Anomaly: Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Ground Equipment Issue; Ground Event / Encounter Loss Of Aircraft Control
Detector: Person Flight Crew; Person Ground Personnel
Result: Flight Crew Became Reoriented; Flight Crew Regained Aircraft Control
Contributing factors: Company Policy; Human Factors; Procedure
Primary problem: Human Factors

Narrative: After a long duty day because of weather delays we finished our four day trip by taxiing into our gate in ZZZ. The ground crew guided us in to the spot and shut down the engines. When the gate agent tried to pull the bridge up to the aircraft she realized the aircraft had been stopped at the wrong spot. We were told we needed to move the aircraft a few inches forward. I made a PA and told passengers that we would have to move forward but missed mentioning to take a seat. We were told by the ground crew to release the brakes so the tug could capture the nose gear.  Because of the confusion between ground crews; gate agent driving the bridge; and us we did not realized the bridge was very close to the aircraft. At the same time the ground crew had not securely captured the aircraft and the aircraft rolled forward about two feet. We were taken by surprise as we were not expecting to move forward. As the aircraft moved forward and immediately set the parking brake but the aircraft had moved about two feet while being close to the bridge and while still having some passengers standing on the aisle. After setting the parking brake the aircraft stopped and flight attendants proceeded to make sure everyone was safely seated. The ground crew then guided the gate agent to move the bridge away from the aircraft and capture the aircraft to then move it back the correct parking spot. The bridge was reconnected and everyone deplaned without any more issues. No one was hurt and there were no damages to the aircraft. The ramp supervisor apologized and explained the ground crew was new to the job.Miscommunication between ground crew; gate agent and flight crew. Inexperience and new to the job by ground crew. Fatigue and long duty day were also factors for the flight crew. Rushing to get everyone off the aircraft. Better communication and verification by flight crews when dealing with ground crews. Understanding and self assessment of alertness and fatigue conditions. Using others to coordinate better and cross check for missed items. Take the time think and assess the situation.




Synopsis: An air carrier Captain reported the aircraft unexpectedly rolled forward at the gate while attempting to reposition the aircraft to align better with the jet bridge due to the ground crew not connecting the tug.