The decision to ban the fans from match was taken by the city's safety group based on evidence shared by police.
In his apology, Guildford admitted AI had assisted searches and provided incorrect evidence that helped inform the decision.
Some of the intelligence referred to a fixture between Maccabi Tel Aviv and West Ham that did not take place.
At appearances on 1 December and 6 January, Guildford told the Home Affairs Select Committee the force "do not use AI", rather that it was a Google search that provided the erroneous information.
In his letter to the chair of the Home Affairs Select Committee published on Wednesday, Guildford said the information "arose as a result of a use of Microsoft Copilot" and offered a "profound apology" for the mistake.
A Microsoft spokesperson told the BBC: "We are not able to replicate what is being reported.
"Copilot combines information from multiple web sources into a single response with linked citations. It informs users they are interacting with an AI system and encourages them to review the sources."
Sir Andy's review found eight inaccuracies in a report from the force to Birmingham's safety group, including a reference to the non-existent Tel Aviv-West Ham game.
Others included overstating the number of Dutch police officers deployed during a Maccabi match in Amsterdam and claims Muslim communities had been intentionally targeted by Tel Aviv fans.
The decision on the ban from the safety group - which is made up of representatives from the council, police and other authorities - prompted political outrage, including from Prime Minister Sir Keir Starmer.
Guildford has insisted the decision was not politically influenced.
West Midlands Police (WMP) said it would continue to engage with the inspection and said the findings recognised the "unintentional nature" of its errors.
"We are extremely sorry for the impact these have had on individuals and their communities," a spokesperson said.
"We are taking immediate action to address the matters raised in these preliminary findings.
"We know that mistakes were made, but reiterate the findings that none of this was done with an intent of deliberate distortion or discrimination."
They said planning around the football match was about "public safety of all communities".
"We will now work tirelessly to rebuild confidence in West Midlands Police," the force added.
Foster said he wanted to question Guildford further at his Accountability and Governance Board, in a meeting scheduled for 27 January.
He said he acknowledged the "significant strength of feeling" on the matter and said he had read Sir Andy's "preliminary views".
"I have been sent that letter having had no sight of, or briefing on, its contents before today. I must now give it careful and detailed consideration," Foster said.