What might be stopping this Contextualised Filter work in Block (please)? I am stuck making a contextualised filter in Block View (and I guess if I knew my question, I would also know my answer).

The view comprises


A set of images which I can see in the View before I set up the Contextualised View with their tags
Relationship with Content: Taxonomy terms on node, choose the correct Taxonomy, and check required
Under Contextual Filters, Taxonomy:name
Default View
Raw value from Url
Position is tricky  .. the path alias is albums/[node:title] but this is a multilingual site so en/albums/[node:title] (I have tried positions 1,2, 3)
Check Specific Validation Criteria
Validator:Taxonomy
Check correct taxonomy
Term Name
Tested check/unchecked spaces to hyphen
Additional information
The tag is input exactly as the [node:title]
If the [node:title] is Barking Dogs, then that is the tag. So the [node:title] is changed by Drupal to barking-dogs and so is the tag.  But the name of the tag is not.  The name of the tag remain Barking Dogs.
Results
When I put a tag name into the preview query, I get the correct results
a.  For one word tags
b.  When I type the phrase with space e.g. The Funniest Cat
When I type the shortened phrase, i.e., funniest-cat, I get no results. Checking the transform spaces into hyphens doesn’t help.
When I use the path alias /albums/[node:title], I get the title, such as The Funniest Cat, but no Block.
The Block itself works – If I request a summary when validation fails, that is displayed.  But no contextualised filter.


I am out of ideas. If anyone can spot where I have gone wrong, I’d be grateful.  Or have an idea how to test, as grateful.
Thanks.
Jo
Found the answer - a logical issue rather than a question of using the controls.

The key was to reverse the order of bringing in content.  Set the main content-type as galleries, then use an entity relationship (set that up first) on Relationship to bring in fields from images and sort on them.

With this procedure, Views can use a Contextual filter for the Galleries. I will wirtie it out more fully on my blog.