I have asked our support teams to add both of your test accounts onto alpha - I will update you once they are added.
We have looked into the invalid URI issue that people have raised and the only way we can replicate it is by not using TEST mode and using the test account. We will get your test accounts added today and hopefully this will solve the problems - thanks
@steveinoz01 @steveb @diana_churchill please could you try again we have copied over all test accounts so let me know if you still have problems filing
That has fixed my problem now.
Thank you 
Thanks to Steveb too 
Thanks chirst, I’ve just tried again using alpha but get this response Invalid schema URI supplied [http://xmlgw.companieshouse.gov.uk http://xmlalpha.companieshouse.gov.uk/v1-0/schema/forms/CompanyIncorporation-v3-0-alpha3.xsd]
Can you see anything wrong with this?
Are you submitting the request to: https://xmlalpha.companieshouse.gov.uk/v1-0/xmlgw/Gateway
My problem was that we had been sending test submissions to https://xmlgw.companieshouse.gov.uk/v1-0/xmlgw/Gateway when we were testing non alpha schemas and that worked fine.
When we started testing v3-0-alpha3 we did not realise we had to send submissions to the revised https://xmlalpha.companieshouse.gov.uk/v1-0/xmlgw/Gateway until Steveb pointed this out. Now CH have copied our test credential to alpha we are able to test again posting to https://xmlalpha.companieshouse.gov.uk/v1-0/xmlgw/Gateway
Can you send the xml through to Simon Nicholas snicholas@companieshouse.gov.uk but can you check you are using test mode and your test account. As the URI is valid and when we have used other customers developers xml it passes through fine. thanks
Removing <>, http:// and substituting single for double quotes in the hope the whole thing will be displayed, I have tried sending:
CompanyIncorporation xsi:schemaLocation=‘xmlgw.companieshouse.gov.uk xmlalpha.companieshouse.gov.uk/v1-0/schema/forms/CompanyIncorporation=v3-0-alpha3.xsd’ xmlns:xsi=‘www.w3.org/2001/XMLSchema-instance’ xmlns=‘xmlgw.companieshouse.gov.uk’
and
CompanyIncorporation xsi:schemaLocation=‘xmlalpha.companieshouse.gov.uk xmlalpha.companieshouse.gov.uk/v1-0/schema/forms/CompanyIncorporation=v3-0-alpha3.xsd’ xmlns:xsi=‘www.w3.org/2001/XMLSchema-instance’ xmlns=‘xmlalpha.companieshouse.gov.uk’
Both fail for different reasons.
The first is the error we have all experienced. The second complains that the ‘xmlalpha.companieshouse.gov.uk:CompanyIncorporation’
element is not declared
And, as you can see, neither example includes the word “Gateway”
I have sent the xml to SimonN to pass on.
I’m obviously doing something wrong.
Please can we have our test account copied to the alpha environment.
Could you pass your details to Simon Nicholas snicholas@companieshouse.gov.uk who can arrange for the details to be copied over but they should already be there as we copied everyone who already had an account on live
"<?xml version="1.0" encoding="UTF-8" ?>
1.0
fatal
Invalid schema URI supplied [http://xmlgw.companieshouse.gov.uk http://xmlgw.companieshouse.gov.uk/v2-1/schema/forms/CompanyIncorporation-v2-6.xsd]
please help to get out of this error
The current schema is shown here:-
http://xmlgw.companieshouse.gov.uk/v1-0/schema/forms/CompanyIncorporation-v3-1.xsd
Current examples as follows:-
http://xmlgw.companieshouse.gov.uk/examples/IncorporationWithPSCAndRegisters.xml
http://xmlgw.companieshouse.gov.uk/examples/IncorporationWithPSCCompanyStatement.xml
SDN
fatal
XML failed schema validation: Invalid XML: Schema in http://xmlgw.companieshouse.gov.uk/v1-0/schema/forms/CompanyIncorporation-v3-1.xsd has a different target namespace from the one specified in the instance document . line 27 column 831
Can you please send me your full XML test submission data to
snicholas@companieshouse.gov.uk
please.
SDN