How to handle (avoid): "Fail to create runspace because you have exceeded your budget to create runspace." - powershell

Question

I have HTTP triggered Azure Function App on PowerShell Core stack. Script is parsing the body of the request, assuming that everything is ok, it connects to Exchange Online and then executes 2 cmdlets to create MailContact type of contact. At the end it disconnects from Exchange Online. I have console app that is executing POST requests passing JSON data for one contact in the body. Requests are executed in a for-each loop and after 5th successful requests I get runspace exceeded budget error.
some code snippets from the script
...
try {
Connect-ExchangeOnline -CertificateThumbprint $thumb -AppId $appId -Organization $org -Showbanner:$false -CommandName Get-Contact,Get-MailContact,New-MailContact,Set-Contact,Set-MailContact,Remove-MailContact
New-MailContact -ErrorAction stop #p | Out-Null
Set-Contact -ErrorAction stop #parameters | Out-Null
}
catch {
...
}
finally {
Disconnect-ExchangeOnline -Confirm:$false -InformationAction Ignore -ErrorAction SilentlyContinue
Get-PSSession | Remove-PSSession
}
What I tried (without success):
relaxation for Exchange Online throttling policy (https://www.michev.info/Blog/Post/3205/self-service-powershell-throttling-policy-relaxation-for-exchange-online)
setting different environmental variables (like PSWorkerInProcConcurrencyUpperBound and FUNCTIONS_WORKER_PROCESS_COUNT)
What worked: having additional Function App and then cycle every 5 requests between the two.
Additional information that might help:
PSWorkerInProcConcurrencyUpperBound = 1000
FUNCTIONS_WORKER_PROCESS_COUNT = 10
Function runtime version = ~4
PowerShell Core Version = 7
Platform = 64Bit
Plan type = Consumption (Serverless)
On addition, it takes around 7-8 sec from sending request till I get the response back. Connecting to Exchange Online takes a lot of time.
Any help or hint how to solve the runspace budget error ?

Answer 1

a dirty workaround would be this:
try {
Connect-ExchangeOnline #ConnectExchange
} catch {
Write-Verbose -Verbose ($_.Exception.Message)
$Wait = ($_.Exception.Message) | Select-String ('(?<=for )(.*)(?= seconds)') -AllMatches
$Count = ([int]$Wait.Matches.Value)
Start-Sleep -seconds $Count
Connect-ExchangeOnline #ConnectExchange
}