See https://azure.status.microsoft/en-us/status/history/
Incident ID VT60-RPZ

Multiple fiber cables on the West Coast of Africa — WACS, MainOne, SAT3, ACE — were impacted which reduced the total supporting capacity for our Regions in South Africa.

In addition to these cable impacts, the on-going cable cuts in the Red Sea — EIG, Seacom, AAE-1 — are also impacting overall capacity on the East Coast of Africa. These incidents together had reduced the total network capacity for most of Africa's regions.

Microsoft have reported Entra issues in South Africa region - no other regions are believed to be impacted.