It comes after government urged Ofcom to use all its powers – up to and including an effective ban – against X.
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It follows significant backlash after Grok digitally undressed people without their consent when tagged beneath images posted on X - something it says it now can only do for those who pay a monthly fee.
Downing Street said the change was "insulting" to victims of misogyny and sexual violence, while a domestic abuse charity called it "monetising abuse".
Technology Secretary Liz Kendall said she expects Ofcom to use its "full legal powers" to hold xAI, Musk's firm which owns X and Grok, to account.
Grok can still edit images on X if accessed through other areas of the platform, such as via its in-built "edit image" function, or on its separate app and website.
"I would remind xAI that the Online Safety Act Includes the power to block services from being accessed in the UK, if they refuse to comply with UK law," Kendall said.
"If Ofcom decide to use those powers they will have our full support."
The minister said she expected the regulator to provide an update on its next steps in "days, not weeks".
An Ofcom spokesperson said: "We urgently made contact on Monday and set a firm deadline of today to explain themselves, to which we have received a response."
"We're now undertaking an expedited assessment as a matter of urgency and will provide further updates shortly."
Ofcom's powers under the Online Safety Act include being able to seek a court order to prevent third parties from helping X raise money or be accessed in the UK - should the firm refuse to comply.
These so-called business disruption measures remain largely untested.
The prime minister's official spokesperson told reporters changes to the way Grok complied with user requests to edit images on the platform showed X "can move swiftly when it wants to".
They said it was "abundantly clear that X n