Since June 9. I don’t know if this is related to the Russian criminal hack of the US government computers:
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FCC ULS down, Amateurs Unable to Submit Applications, Filing Deadlines Extended
The FCC Universal Licensing System (ULS) has been experiencing an outage since Friday, June 9, 2023. Amateur licensees are unable to submit applications or process renewals. Filing deadlines have been extended. The FCC has been communicating updates with VECs, including ARRL VEC about the situation, which remains fluid. As of late afternoon on Thursday, June 15, 2023 the FCC had no timeline for when the ULS would be back online.
For the latest information, watch the ARRL News feed. The story about the issue posted there will remain updated with the latest information.”