From the article

In parallel, the Commission has opened four market investigations to further assess Microsoft’s and Apple’s submissions arguing that, despite meeting the thresholds, some of their core platform services do not qualify as gateways:

Microsoft: Bing, Edge and Microsoft Advertising Apple: iMessage Under the DMA, these investigations aim to ascertain whether a sufficiently substantiated rebuttal presented by the companies, demonstrate that services in question should not be designated. The investigation should be completed within a maximum of 5 months.