[Azure Function] Connect-PnPOnline -ManagedIdentity wants uriString

[tabit01]

I want to connect using Connect-PnPOnline -ManagedIdentity in a Function App, following the example. I have successfully used the identity for Connect-MgGraph -Identity in the same function.

However I get

2024-01-08T14:47:12Z   [Error]   ERROR: Value cannot be null. (Parameter 'uriString')

Exception             : 
    Type       : System.ArgumentNullException
    Message    : Value cannot be null. (Parameter 'uriString')
    ParamName  : uriString
    TargetSite : Void .ctor(System.String)
    Data       : System.Collections.ListDictionaryInternal
    Source     : System.Private.Uri
    HResult    : -2147467261
    StackTrace : 
   at System.Uri..ctor(String uriString)
   at PnP.PowerShell.Commands.Base.ConnectOnline.Connect(CancellationToken& cancellationToken) in c:\build\src\Commands\Base\ConnectOnline.cs:line 280
   at PnP.PowerShell.Commands.Base.ConnectOnline.ProcessRecord() in c:\build\src\Commands\Base\ConnectOnline.cs:line 248
   at System.Management.Automation.CommandProcessor.ProcessRecord()
CategoryInfo          : NotSpecified: (:) [Connect-PnPOnline], ArgumentNullException
FullyQualifiedErrorId : System.ArgumentNullException,PnP.PowerShell.Commands.Base.ConnectOnline
InvocationInfo        : 
    MyCommand        : Connect-PnPOnline
    ScriptLineNumber : 68
    OffsetInLine     : 9
    HistoryId        : 1
    ScriptName       : C:\home\site\wwwroot\EnterpriseAppSAMLExpirationMonthly\run.ps1
    Line             : Connect-PnPOnline -ManagedIdentity
                       
    PositionMessage  : At C:\home\site\wwwroot\EnterpriseAppSAMLExpirationMonthly\run.ps1:68 char:9
                       +         Connect-PnPOnline -ManagedIdentity
                       +         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    PSScriptRoot     : C:\home\site\wwwroot\EnterpriseAppSAMLExpirationMonthly
    PSCommandPath    : C:\home\site\wwwroot\EnterpriseAppSAMLExpirationMonthly\run.ps1
    InvocationName   : Connect-PnPOnline
    CommandOrigin    : Internal
ScriptStackTrace      : at <ScriptBlock>, C:\home\site\wwwroot\EnterpriseAppSAMLExpirationMonthly\run.ps1: line 68

when trying to connect using MI. What am I missing?

Requirements.psd1:

@{
    # For latest supported version, go to 'https://www.powershellgallery.com/packages/Az'. 
    # To use the Az module in your function app, please uncomment the line below.
    # 'Az' = '10.*'
    'PnP.PowerShell' = '2.2.0'
    'Microsoft.Graph.Authentication' = '2.9.1'
    'Microsoft.Graph.Groups' = '2.9.1'
    'Microsoft.Graph.Applications' = '2.9.1'
    'Microsoft.Graph.Users.Actions' = '2.9.1'
}