The specified IP range is too large for O365? – Hornetsecurity KnowledgeBase

Unfortunately, it is not possible to allow IP Ranges larger than /24 in the O365 Admin Center. Please use the following IP Ranges instead of 94.100.128.0/20

94.100.128.0/24

94.100.129.0/24

94.100.130.0/24

94.100.131.0/24

94.100.132.0/24

94.100.133.0/24

94.100.134.0/24

94.100.135.0/24

94.100.136.0/24

94.100.137.0/24

94.100.138.0/24

94.100.139.0/24

94.100.140.0/24

94.100.141.0/24

94.100.142.0/24

94.100.143.0/24

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