iOS mobileconfig file for forcing IPv4 on Fido cellular data APN to resolve VPN connectivity issues - https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA1Ki000000fxlXKAQ&lang=en_US

Fido-IPv4.mobileconfig

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>PayloadContent</key>
    <array>
        <dict>
            <!-- Configures the initial network connection APN -->
            <key>AttachAPN</key>
            <dict>
                <key>Name</key>
                <string>fido-core-appl1.apn</string>
                <!-- Use IPv4 only (value 1) -->
                <key>AllowedProtocolMask</key>
                <integer>1</integer>
            </dict>
            <!-- Overrides specific settings for Data and Hotspot APNs -->
            <key>APNs</key>
            <array>
                <!-- Primary Fido LTE Data settings -->
                <dict>
                    <key>Name</key>
                    <string>fido-core-appl1.apn</string>
                    <!-- Ensure IPv4 is used for data and roaming -->
                    <key>AllowedProtocolMask</key>
                    <integer>1</integer>
                    <key>AllowedProtocolMaskInRoaming</key>
                    <integer>1</integer>
                    <key>AllowedProtocolMaskInDomesticRoaming</key>
                    <integer>1</integer>
                </dict>
                <!-- Alternate/Tethering settings (covers ltemobile.apn just in case) -->
                <dict>
                    <key>Name</key>
                    <string>ltemobile.apn</string>
                    <!-- Ensure IPv4 is used for tethering/alt data -->
                    <key>AllowedProtocolMask</key>
                    <integer>1</integer>
                    <key>AllowedProtocolMaskInRoaming</key>
                    <integer>1</integer>
                    <key>AllowedProtocolMaskInDomesticRoaming</key>
                    <integer>1</integer>
                </dict>
            </array>
            <key>PayloadDescription</key>
            <string>Configures Fido Data and Hotspot (Strict IPv4)</string>
            <key>PayloadDisplayName</key>
            <string>Fido APN (IPv4)</string>
            <key>PayloadIdentifier</key>
            <string>com.fido.apn.config</string>
            <key>PayloadType</key>
            <string>com.apple.cellular</string>
            <key>PayloadUUID</key>
            <string>8f2e91bb-a4bf-4725-8ee3-f1d0f1d0f1d0</string>
            <key>PayloadVersion</key>
            <integer>1</integer>
        </dict>
    </array>
    <key>PayloadDisplayName</key>
    <string>Fido Settings (IPv4 Only)</string>
    <key>PayloadIdentifier</key>
    <string>com.fido.profile</string>
    <!-- Allows the user to remove this profile -->
    <key>PayloadRemovalDisallowed</key>
    <false/>
    <key>PayloadType</key>
    <string>Configuration</string>
    <key>PayloadUUID</key>
    <string>2d08e545-7b7a-47f4-95f0-f1d0d00dbeef</string>
    <key>PayloadVersion</key>
    <integer>1</integer>
</dict>
</plist>